Change content of a div on another page

Question

On page 1, I have a div containing information.

And on page 2, I have a form

Answer 1

One way is to do like what the other answers mentioned, to have each tab communicate to a central server that will get/send data to keep both tabs updated using AJAX for example.

But I'm here to tell you about another way though, it's to use what we already have designed for this kind of task exactly. What so called browser localStorage

Browser storage works like this pseudo code:

  //set the value, it works as a hash map or assoc array. 
   localStorage .setItem("some_index_key", "some data") ; 
   // get the value by it's index key. 
   localStorage .getItem("some_index_key") ; // will get you "some data" 

Where all the data will be shared among all open tabs for the same domain. And you can add event listener so whenever one value change, it will be reflected on all tabs.

addEvent(window, 'storage', function (event) {
  if (event.key == 'some_index_key') {
    output.innerHTML = event.newValue;
  }
});

addEvent(myInputField, 'keyup', function () {
  localStorage.setItem('some_index_key', this.value);
});

Check out this DEMO, you edit one field on page-A, and that value will be reflected on page-B offline without the need to burden the network.

To learn more, read this.

Real live example. The background color is controlled from another tab.

     var screenone = document.getElementById('screenone');

            screenone.addEventListener('keydown', screenOneFunction);
            screenone.addEventListener('change', screenOneFunction);
           
    function screenOneFunction()
            {
                document.body.style.backgroundColor = this.value;
                localStorage.setItem("color1", this.value);
            }
            
            
            
            var screentwo = document.getElementById('screentwo');

            screentwo.addEventListener('keydown', function (evt) {
                localStorage.setItem("color2", this.value);
            });
            screentwo.addEventListener('change', function (evt) {
                localStorage.setItem("color2", this.value);
            });



            var thebutton = document.getElementById('thebutton');

            thebutton.addEventListener('click', function (evt) {
                localStorage.clear();
                screenone.value = "";
                screentwo.value = "";
                document.body.style.backgroundColor = "";
            });



            var storageHandler = function () {
                document.body.style.backgroundColor = localStorage.color2;
                var color1 = localStorage.color1;
                var color2 = localStorage.color2;
                screenone.value = color2;
                screentwo.value = color1;

            };
            window.addEventListener("storage", storageHandler, false);

       .screenone{ border: 1px solid black;}
       input{ margin: 10px; width: 250px; height: 20px; border:round}
      label{margin: 15px;}

         
    
    
         Type a color name e.g. red. Or enter a color hex code e.g. #001122 
        

         
         This tab  
        

         
         Other opned tabs